Calcium
Description
Calcium is the most abundant mineral in the human body, primarily stored in bones and teeth, providing structural integrity. It plays a crucial role in maintaining bone density throughout life, preventing conditions like osteoporosis. Beyond structural support, calcium is vital for various physiological processes. It is essential for proper muscle contraction and relaxation, including the heartbeat. Calcium also facilitates nerve signal transmission, enabling communication between the brain and the rest of the body. Furthermore, it is involved in blood clotting mechanisms and hormone secretion, ensuring overall bodily regulation. Maintaining adequate calcium intake is fundamental for overall health. However, its absorption and utilization are complex, often requiring the presence of other nutrients like Vitamin D and Magnesium for optimal efficacy. Dietary sources and supplementation are common ways to ensure sufficient levels.
Sources
Dairy products (milk, yogurt, cheese)Leafy green vegetables (kale, spinach, broccoli)Fortified foods (cereals, orange juice, plant-based milks)TofuSardinesAlmonds
Cheapest Calcium supplements
Best Calcium supplements
Value Calcium supplements
Timing & Intake
AnytimeWith foodTake with Vitamin D, Magnesium
Calcium carbonate is best absorbed with food. Spreading doses throughout the day (e.g., 500mg at a time) can optimize absorption.
Daily Intake
RDA (Men)1000 mg
RDA (Women)1000 mg
RDI1000 mg
Optimal Dosage
Minimum1000 mg
Maximum1500 mg
Safety & Toxicity
Upper Limit (UL)2500 mg
Toxicity Threshold3000 mg
Toxicity EffectKidney stones, impaired absorption of other minerals
Goals
Bone Health
Impact
Highest effect
Typical dose:500–1200 mg
Calcium is the most abundant mineral in the body, with over 99% stored in the skeleton. It serves as the main building block for bone tissue. Adequate intake is crucial to achieve peak bone mass during youth and to minimize bone loss with age.
View goal →
Nail Health
Impact
Limited evidence
While nails are composed of keratin protein, not primarily calcium, severe calcium deficiency can affect overall health, which may be reflected in nail quality. It plays a supportive role in cellular processes and maintaining the hardness of surrounding bone and tissues.
View goal →
Interactions
Positive Interactions
Vitamin D
Vitamin D is crucial for the absorption of calcium in the intestines.
Magnesium
Magnesium works synergistically with calcium in bone formation, muscle contraction, and nerve function, and helps regulate calcium levels.
Vitamin K
Vitamin K directs calcium to the bones and helps prevent its deposition in soft tissues like arteries.
Phosphorus
Calcium and Phosphorus are the primary minerals for forming and maintaining strong bones and teeth.
Recommended products
Best 
Bone Builder Extra Strength
Metagenics
Calcium: 1010 mg
A high-strength bone support product featuring a blend of MCHC and dicalcium phosphate for comprehensive calcium and phosphorus delivery, beneficial for bone and nail health.
Best 
Bone Solid
Country Life
Calcium: 1011 mg
Country Life Bone Solid is a highly comprehensive supplement designed to support robust bone health through a rich blend of essential minerals and key vitamins like D3 and K.
Value 
Calcium 600 mg plus Vitamin D3
Sundown
Calcium: 1200 mg
A calcium carbonate supplement offering 600 mg of calcium per serving (implied) with added Vitamin D3 for improved absorption, a solid choice for bone health.
Budget 
Complete Multivitamin Adults 50+
Equate
Calcium: 220 mg
This multivitamin for adults 50+ offers a foundational blend of essential vitamins, minerals, and key carotenoids like Lutein and Lycopene, supporting general health, bone density, and vision at a very accessible price.
Budget 
Complete Multivitamin Adults 50+
Equate
Calcium: 220 mg
This multivitamin is designed for adults over 50, offering higher Vitamin D3 and eye-supporting nutrients at a very cost-effective price, providing good daily nutritional support.
Value 
600+D3
21st Century
Calcium: 600 mg
An economical calcium carbonate tablet providing a moderate dose of calcium and beneficial Vitamin D3 for improved absorption and bone health.
Best 
Bone Restore with Vitamin K2
Life Extension
Calcium: 700 mg
This supplement offers a comprehensive blend of calcium, Vitamin D3, Vitamin K2, and essential trace minerals to support bone density, though it contains a very high calcium dose per serving.
Budget 
Niacin 250 mg
21st Century
Calcium: 125 mg
An affordable Niacin supplement with a moderate 250 mg dose, plus calcium, well-suited for regular intake and those targeting specific wellness goals.
Value 
Calcium 500 mg with Vitamin D3
Nature's Bounty
Calcium: 500 mg
A highly affordable and effective combination of oyster shell calcium (500mg) and Vitamin D3 for robust bone and nail support.
Budget 
Calcium Magnesium Zinc + D3
21st Century
Calcium: 1000 mg
This supplement provides key minerals and Vitamin D3 at mostly reasonable dosages, but its reliance on less bioavailable forms like calcium carbonate, magnesium oxide, and zinc oxide may limit absorption and overall effectiveness.
Value 
Calcium 600 with Vitamin D3
Nature's Bounty
Calcium: 600 mg
A robust calcium carbonate supplement delivering 600mg of elemental calcium with essential Vitamin D3 for better absorption, making it an excellent, economical choice for comprehensive bone and nail support.
Best 
Cal/Mag/Vit D3 with Vitamin K2 Vanilla
NaturesPlus
Calcium: 1200 mg
A vanilla-flavored chewable blend offering very high doses of calcium (2400mg) and magnesium (1200mg), plus D3 and K2 (MK-7); the calcium dose is a major concern.
Value 
Calcium 500+D3
21st Century
Calcium: 500 mg
This highly affordable supplement provides 500mg of oyster shell calcium with added Vitamin D3, offering effective and economical support for bone and nail health.
Best 
Organic Plant Calcium
Garden of Life MyKind Organics
Calcium: 800 mg
A comprehensive, organic plant-based calcium supplement with a strong blend of Vitamin D and K2 for robust bone and cardiovascular support.
Value 
600 Calcium Supplement
21st Century
Calcium: 600 mg
A basic calcium carbonate supplement providing 600 mg of calcium, but without the essential addition of Vitamin D.
Budget 
B-1 100 mg
21st Century
Calcium: 180 mg
This offers a robust 100mg of Thiamine (Vitamin B1) alongside a modest amount of calcium, making it a good fit for targeted energy and nerve support with some added mineral benefit.
Value 
Calcium 500 + D3
21st Century
Calcium: 500 mg
A very affordable and popular supplement combining 500mg oyster shell calcium with Vitamin D3 for effective bone and nail support.
Best 
Cal/Mag Plus with Vitamin D and Vitamin K2 MK-7
Metabolic Maintenance
Calcium: 167 mg
A calcium and magnesium blend using well-absorbed forms, but the supporting Vitamin D3 and K2 doses are notably low.
Value 
Chewable Calcium 600 mg + D3 Coffee Mocha Flavor
Mason Natural
Calcium: 600 mg
A chewable calcium carbonate supplement providing 600 mg of calcium and Vitamin D3 in a coffee mocha flavor, making it a palatable option for daily bone health.
Value 
600+D3
Caltrate
Calcium: 600 mg
A daily tablet providing calcium and vitamin D3, supported by a blend of other essential minerals to contribute to bone health and overall mineral balance.
Best 
Cal/Mag/Vit D3 with Vitamin K2 Chocolate
NaturesPlus
Calcium: 600 mg
A chocolate-flavored chewable blend providing significant amounts of calcium, magnesium, D3, and K2 (MK-7), balancing convenience with comprehensive bone support.
Budget 
Calcium Carbonate 650 mg Unflavored
Nutricost
Calcium: 650 mg
An unflavored liquid calcium carbonate supplement, offering flexible dosing for easy consumption.
Value 
600+D3
21st Century
Calcium: 600 mg
A calcium carbonate tablet with Vitamin D3, providing core nutrients for bone and nail health.
Budget 
Prenatal Multivitamin/Multimineral with Folate
Spring Valley
Calcium: 200 mg
<p>This prenatal multivitamin delivers a key set of vitamins and minerals, including a good amount of folate and iron, tailored to support nutritional needs during pregnancy at a very affordable price.</p>
Best 
Cal-Mag Citrate with Vitamin D-3 & K-2 2:1 Ratio
Solaray
Calcium: 1000 mg
A comprehensive blend offering calcium citrate and a high dose of magnesium (citrate/oxide), along with effective amounts of Vitamins D3 and K2 (MK-7), for bone and heart support.
Budget 
C 250 mg
21st Century
Calcium: 140 mg
A very affordable tablet providing 250 mg of ascorbic acid Vitamin C and 140 mg of calcium, ideal for basic daily support.
Best 
Organic Plant Calcium
Garden of Life MyKind Organics
Calcium: 800 mg
A larger, more economical pack of the organic plant-based calcium supplement, featuring Vitamin D and K2 for enhanced bone and heart health support.
Best 
Bone Solid
Country Life
Calcium: 1011 mg
Country Life Bone Solid is a highly comprehensive supplement designed to support robust bone health through a rich blend of essential minerals and key vitamins like D3 and K, available in a larger quantity for extended use.
Product stats
Price per product
Average$31.09
Median$23.99
Price per serving
Average$0.82
Median$0.55
Price per 100 mg
Average$0.32
Median$0.13
Price distribution
Price per serving distribution
Price per 100 mg
Reference amount: 100 mg
Forms
Paired ingredients
Ingredient forms
Calcium Carbonate (296) 75
Calcium carbonate is a widely available and cost-effective form of calcium, containing approximately 40% elemental calcium by weight. Its absorption is acid-dependent, meaning it requires stomach acid for optimal dissolution and uptake, making it most effective when taken with meals.
Pros
- High elemental calcium content per pill
- Inexpensive
- Widely available
Cons
- Requires stomach acid for absorption (best taken with food)
- Can cause gas, bloating, and constipation in some individuals
Per product
Avg$19.92
Med$17.86
Per serving
Avg$0.40
Med$0.28
Per 100 mg
Avg$0.11
Med$0.06
Price distribution
Calcium Citrate (239) 85
Calcium citrate is a highly bioavailable form of calcium, containing about 21% elemental calcium by weight. Unlike calcium carbonate, its absorption is not dependent on stomach acid, allowing it to be taken with or without food. It is generally better tolerated and less likely to cause gastrointestinal side effects.
Pros
- Excellent bioavailability
- Can be taken with or without food
- Less likely to cause constipation or gas
Cons
- Lower elemental calcium per tablet requires more pills for the same dose
- Generally more expensive than calcium carbonate
Per product
Avg$30.91
Med$23.09
Per serving
Avg$0.89
Med$0.55
Per 100 mg
Avg$0.16
Med$0.06
Price distribution
Dicalcium Phosphate (84) 70
Dicalcium phosphate is a dietary supplement ingredient that provides both calcium and phosphorus, two essential minerals crucial for bone health and other physiological processes. While it provides elemental calcium, its bioavailability can vary and may be lower than more soluble forms like calcium citrate. It is commonly found in multi-mineral supplements.
Pros
- Provides both calcium and phosphorus
- Supports bone and teeth structure
Cons
- Bioavailability may be less optimal than other forms
- Lower elemental calcium contribution compared to carbonate
Per product
Avg$29.15
Med$18.51
Per serving
Avg$1.10
Med$0.34
Per 100 mg
Avg$0.18
Med$0.09
Price distribution
Calcium Ascorbate (44) 65
Calcium ascorbate is a mineral salt of ascorbic acid (Vitamin C). It provides a non-acidic form of Vitamin C, which is often preferred by individuals sensitive to the acidity of pure ascorbic acid. While it contains some elemental calcium, its primary purpose is as a Vitamin C source for immune support, antioxidant activity, and collagen formation, not as a major calcium supplement for bone health.
Pros
- Non-acidic Vitamin C
- Provides antioxidant benefits
- Supports collagen synthesis
Cons
- Provides a relatively small amount of elemental calcium
- Not a primary calcium source
Per product
Avg$33.72
Med$29.49
Per serving
Avg$0.86
Med$0.71
Per 100 mg
Avg$0.17
Med$0.11
Price distribution
Calcium Malate (35) 80
Calcium malate is a calcium salt of malic acid, an organic acid found in many fruits. This form is considered to have good bioavailability and absorption, similar to calcium citrate, and is generally well-tolerated without significant gastrointestinal side effects. It provides a reliable source of elemental calcium for various bodily functions.
Pros
- Good bioavailability and absorption
- Generally well-tolerated
Cons
- Less common and potentially more expensive than calcium carbonate
- Lower elemental calcium per dose compared to carbonate
Per product
Avg$29.31
Med$23.67
Per serving
Avg$0.60
Med$0.37
Per 1000 mg
Avg$1.28
Med$0.46
Price distribution
Calcium D-Pantothenate (29) 60
Calcium D-pantothenate is the calcium salt of D-pantothenic acid, also known as Vitamin B5. While it contains calcium, its primary role in supplements is to deliver pantothenic acid, which is vital for energy metabolism and hormone synthesis. The elemental calcium contribution is relatively small and it is not typically used as a primary calcium supplement for bone health.
Pros
- Excellent source of Vitamin B5
Cons
- Provides minimal elemental calcium compared to dedicated calcium supplements
- Not intended as a primary calcium source
Per product
Avg$35.16
Med$31.99
Per serving
Avg$1.11
Med$0.79
Per 100 mg
Avg$0.19
Med$0.12
Price distribution
Calcium Amino Acid Chelate (17) 90
Calcium amino acid chelates (e.g., calcium bisglycinate, calcium glycinate) are forms where calcium ions are bonded to amino acids. This chelation process protects the mineral from interference in the gut, leading to superior absorption and bioavailability compared to inorganic forms. They are often well-tolerated and less likely to cause gastrointestinal discomfort.
Pros
- Superior absorption and bioavailability
- Generally gentle on the stomach
- Well-tolerated
Cons
- Can be significantly more expensive than other forms
- Elemental calcium content can vary depending on the specific chelate
Per product
Avg$28.24
Med$26.08
Per serving
Avg$0.57
Med$0.52
Per 1000 mg
Avg$0.82
Med$0.62
Price distribution
Calcium Hydroxyapatite (15) 88
Calcium hydroxyapatite is a microcrystalline hydroxyapatite (MCHA) complex derived from bovine bone. It provides calcium, phosphorus, and other naturally occurring trace minerals in a highly bioavailable form, mirroring the mineral matrix of human bone. This form is believed to offer benefits beyond elemental calcium due to its complex natural composition.
Pros
- Natural, bone-derived source
- Contains phosphorus and trace minerals in physiological ratios
- May offer holistic bone support
Cons
- Higher cost
- Potential concerns for those avoiding animal products
- Elemental calcium content can be lower per dose than carbonate
Per product
Avg$26.30
Med$25.99
Per serving
Avg$0.48
Med$0.43
Per 1000 mg
Avg$0.20
Med$0.14
Price distribution